Easy to locate. Checkin and checkout was a breeze. Great location in terms of proximity to airport bus stop, subway (Exit 1 with elevator), restos, Myeongdong shopping street etc. I like the hostel in general, but I really appreciate the little things they did. We requested a room in a lower floor because my sister has bad knees and they kindly accommodated us to a 1st floor twin room. They also presented us gifts upon checkin (cosmetics). And thumbs up for providing a sort of extension cord for the room so no need for plug adapters. Room has tv, bathroom, hairdryer (yey!) and wifi router. Breakfast is just bread and a variety of spread plus coffee but it's good and filling. Receptionist is kind and communicates English well. You can leave luggage after checkout.
Ps: If you are used to big bath towels, you should bring them because what they provide are smaller towels. Room size is ok for us, but would probably be too small for bigger guests.
I definitely recommend Vestin and will probably book here again next time.